<template>
    <div class="selection-component">
      <div class="selection-show">
        <span v-text="selections[nowIndex].label" @click="toggleDrop"></span>
        <div class="arrow"></div>
      </div>
      <div class="selection-list" v-if="isDrop">
        <ul>
          <li v-for="(item,index) in selections" @click="chooseSelection(index)">{{item.label}}</li>
        </ul>
      </div>
    </div>
</template>

<script>
  import { eventBus } from '../../eventBus'
  export default{
    props:{
      selections:{
        type: Array,
        default:[
          {
            label:'test',
            value:0
          }
        ]
      }
    },
    data(){
      return{
        isDrop:false,
        nowIndex:0
      }
    },
    mounted () {
      eventBus.$on('reset-status', () => {
        this.isDrop = false
      })
    },
    methods:{
      toggleDrop(event){
        event.stopPropagation()
        this.isDrop = !this.isDrop
        if (!this.isDrop) {
          eventBus.$emit('reset-status')
        }
      },
      chooseSelection(index){
        this.nowIndex = index
        this.isDrop = false
        this.$emit('on-change',this.selections[this.nowIndex])
        eventBus.$emit('reset-status')
      }
    }
  }
</script>

<style scoped>
.selection-component {
  position: relative;
  display: inline-block;
}
.selection-show {
  border: 1px solid #e3e3e3;
  padding: 0 20px 0 10px;
  display: inline-block;
  position: relative;
  cursor: pointer;
  height: 25px;
  line-height: 25px;
  border-radius: 3px;
  background: #fff;
}
.selection-show .arrow {
  display: inline-block;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid #e3e3e3;
  width: 0;
  height: 0;
  margin-top: -1px;
  margin-left: 6px;
  margin-right: -14px;
  vertical-align: middle;
}
.selection-list {
  display: inline-block;
  position: absolute;
  left: 0;
  top: 25px;
  width: 100%;
  background: #fff;
  border-top: 1px solid #e3e3e3;
  border-bottom: 1px solid #e3e3e3;
  z-index: 5;
}
.selection-list li {
  padding: 5px 15px 5px 10px;
  border-left: 1px solid #e3e3e3;
  border-right: 1px solid #e3e3e3;
  cursor: pointer;
  background: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;

}
.selection-list li:hover {
  background: #e3e3e3;
}
</style>
